Is addition of bromine stereospecific?

Bromine Addition to Trans 2-Pentene The addition of bromine to alkenes is a stereospecific reaction. In particular, the analysis below will show that this reaction is stereospecific for anti addition. The fact that the reaction follows anti addition provides important details of how the reaction mechanism must proceed.

Why bromine is generated during the reaction in situ )?

Since bromine is volatile and highly toxic by inhalation, we will be generating it in situ. When a reagent is formed in situ, this means that instead of adding the reagent directly, it is produced in the reaction mixture.

What product is formed from the reaction of Phenylpropanoic acid with Br2?

The reaction of trans-cinnamic acid with Br2 yields the dibromide product 2,3-dibromo-3-phenylpropanoic acid. Select the consequence that is LEAST likely to occur if the dibromide product is recrystallized in dichloromethane, rather than a solution of 50% aqueous ethanol.

Why is bromination stereospecific?

Bromination of alkenes is stereospecific because the geometry of the starting alkene determines which diastereoisomer is obtained as the product. Bromination of Z– and E-2-butene in acetic acid produces a single diastereoisomer in each case, both of which are different from each other.

What is the stereochemistry of bromination of an alkene?

The stereospecificity of bromine addition can be explained by considering the anti-addition or trans-addition. alkene to form a flat carbocation. Then the bromide ion would attack the bottom face of the alkene. Thus anti-addition to cis-2 butene leads to the formation of an enantiomer.

Is bromination an addition reaction?

The reaction is an example of electrophilic addition. The bromine is a very “polarizable” molecule and the approaching pi bond in the ethene induces a dipole in the bromine molecule.

Is the bromine test an addition reaction?

The bromine test is used to test for an unsaturated carbon carbon bond, such as an alkene or alkyne. The test uses a type of chemical reaction called addition, where a reactant, here bromine, is added to an organic compound to break a double or triple bond.